Drilling-machine



(No-Model.) E.`J. WORCESTER.

DIIILLING MACHINE. No.l274,243. l Patented 1V[ar.20,1883.,V

W [155555- Y LQVEQIEV.

y MQW Worcester,

, UNITED4 STATES PATENT` OFFICE.

DRILLING- MACHINE.

SPECIFICATION forming part of Letters Patent .No. 274,243, dated.V March20, 1883. Application mea Aprn s, 1882. (No model.)

To all whom 'it lmay concern:

Beit known that I, EDWARD J. WORCES- TEE,a citizen of the United States,residing at in the county of Worcester and State of Massachusetts, haveinvented a new Y and useful Improvement in Drilling-Machines,

of which the following is a specification.

My invention relates to self-feedin g or blacksiniths andcarriage-makers7 drillin g-rnachi nes, objects to impart a vfeedingmotion to the drill-spindle, to provide a wheelrest for holding thecarriage-wheel while drilling the tire, to vary the speedofthe-drillspindle, and also to disconnect the balancewheel from thedrill-spindle at will. The following is a full and exact description ofmy invention, reference being had to the aecompanying drawings, inwhiching-machine are similar to i and balance-Wheel shaft G.

Figure l shows a front view of the drillingmachine; Fig. 2, a side view;Fig. 3, a sectional view of the grinding device on the line x x; Figa, adetached view of the feeding device, and Figs. 5 and 6 detached portionsof the feeding device.

Similar letters refer to similar parts in the.

several views.-

llhe construction and arrangement ot the main operating portions of myimproved drillthe self-feeding drilling-machines in ordinary use.

A A represent the frame-work; B, the drillspindle, having the beveledpinion C; D, the crank-hub, xed to the driving-shaft by the set-screw f.C' 'is the driving beveled gear. C is a spur-gear upon thedriving-shaft,which imparts motion, through the intermediate, F, ruiming loose uponthe stud F', to the gear G I is the balancewheel.

0n the main driving-shaft is the eccentric E, Figs. l and 4, whichimparts a rocking motion to the bell-crank lever upon 4the stud Hthrough the connecting-bar E.4 The vertical and long arm H carries thepawl a, whose forward motion gives a rotary motion to the crownratchet-wheel b, whose hub, securely held in the frame-work, has aninternal screwthread, which,operating the screw swiveled to the upperend of the drill-spindle, gives a vertically-sliding motion to thedrill-spindle 5o in the manner machines.

The end G ofthe balance-wheel shaft is iitted to receive the crank-hubD. The gears G and C are so proportioned that the speed common toself-feeding drillingof the balance-wheel will be considerably l tirelydisconnected from kthe driving-shaft,

which is very desirable in many cases when small drills are used, orwhen the grinding device is to be used independently of thedrillspindle. The use of the intermediate, F, also gives the samedirectionto the rotary motion ofthe shaft G as the driving-shaft, andobviates the necessity of reversing the motion of the crank when thedrill is driven from the shaft G. The short arm H of the hell-cranklever has a vertical slot, O, and an adjustingscrew, 0', and theconnecting-bar E' has its upper end forked to inclose the slotted end ofthe a-rmH,l and has a pin, d, which passes through the slot 0. When theadjustingscrew O is Withdrawn the reciprocatingmotion of the bar E',actuated `by the eccentric E, is lost7 by the pin d, sliding in theslot0, and the arm H" will receive no motion 5 butif the screw 0' isadvanced upon the pin d, so that the lost motion 7 is taken up, the armH" will have a vibration equal to thc throw cf the eccentric E, the pawla in its backward motion passing over the teeth of theratchet b. Thus itwill be seen the amountof the feeding motion may be varied by theadjusting-screw O', no

.springs being required and both the backward and forward motion of thepawl being positive.

To the frame of the drill I attach the plate l, having the swingingframe 2, hinged at its lower edge by the pins 8, and carrying inVsuitable journals at its upper edge the arbor 9, with the friction-wheel5 arranged to revolve in the same plane as the balance-Wheel I. On theend of the arbor 9 is the grinding-'wheel 3, and to the plate lisattached the rest 7 4,

The screw M should pass through the plate v P and just touch the sleeveS when the pinN is in a horizontal position, and may be adjusted tosecure the proper position of the pin N. Upon the pin N the hub of acarriage or other Wheel may be placed While the tire is being drilled,the Wheel being turned 011 the pin N as the successive holes aredrilled, thereby furnishing a support for the Wheel Without vmarring theWood-work ofthe Wheel. The slide S both slides and turns upon the postT, allowing either the table J or the pin N to be brought beneath thedrill, when it may be fastened in position by the set-screw s.

I am aware that drilling-machines have been constructed with abalance-Wheel shaft geared directly to the driving-shaft, and having thespeed of the drill-spindle varied by transferring the crank to thebalance-wheel shaft and reversing the motion of the crank. I do notclaim such a construction. Neither do I claim the construction andoperation of the grinding device shown and referred to in the foregoingspecification, nor the combination of a grinding device with adrilling-'machine. These have been made the subject of a separateapplication 5 but What I do claim is- 1. The combination of theratchet-Wheel b, vibrating bell-crank lever having arms H and H",connecting-bar E', and eccentric E, asdescribed, and for the purposes4set forth. p 2. The combination ot' the lratchet-'Wheel b, bell-cranklever with arms H and H, slot O and adjusting-screw O', and theconnectingbar E', actuated by the 'eccentric E, and having the pin d, asdescribed, and for the purposes set forth.

3. The combination, with the drill-shaft B,

having the beveled pinion C, and the drivingshaft having the beveledgear C', the gear C, and crank-hub D, of the sliding intermediatepinion, F, and balance-Wheel shaft having the wheel I and gear G, asdescribed, and for the purposes set forth.

4. The combination, with the drill-spindleB and post T, of the slidingsleeve S,and a wheelrest consisting of a pin, N, as described, and forthe purposes set forth.

5. The combination, with the drill-spindle B, post T, and sliding sleeveS, of a wheelrest consisting of a pin, N, and swinging plate P, withadjusting-screw M, as described, and for the purposes set forth.

EDWARD J. Woacnsrna.

Witnesses:

GEORGE R. BALL, J oHN E. SULLivAN.

